getrusage.test: check that getrusage parser does not access extra memory
getrusage.test: check that getrusage parser does not access extra memory

Place struct rusage at the end of an allocated memory page followed by
an inaccessible page.

* tests/getrusage.c (main): Use tail_alloc.

cuviper/strace,cuviper/strace,cuviper/strace,cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace